H04M 19/026
Arrangements for interrupting the ringing current
Official title: {Arrangements for interrupting the ringing current}
H04M19/026 (Arrangements for interrupting the ringing current) appears on 94 US grants and 7 published applications in this corpus.
Search patents in H04M- Granted patents
- 94
- Published applications
- 7
- Assignees
- 46
- Inventors
- 146
- Latest grant
- 28 Jan 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 2 | 0 |
| 1978 | 4 | 0 |
| 1979 | 5 | 0 |
| 1980 | 4 | 0 |
| 1981 | 4 | 0 |
| 1982 | 7 | 0 |
| 1983 | 2 | 0 |
| 1984 | 10 | 0 |
| 1985 | 9 | 0 |
| 1986 | 1 | 0 |
| 1987 | 4 | 0 |
| 1988 | 5 | 0 |
| 1989 | 5 | 0 |
| 1990 | 2 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 3 | 0 |
| 1995 | 2 | 0 |
| 1996 | 4 | 0 |
| 1997 | 4 | 0 |
| 1998 | 3 | 0 |
| 1999 | 2 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 2 | 2 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 1 | 0 |
| 2006 | 1 | 0 |
| 2007 | 1 | 0 |
| 2008 | 1 | 1 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 1 | 0 |
| 2013 | 0 | 1 |
| 2014 | 1 | 0 |
| 2015 | 0 | 1 |
| 2016 | 0 | 1 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 1 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Ringing suppression circuit28 Jan 2025US 12,212,708 B2Amazing Microelectronic Corp.
- Method and apparatus for providing ringing timeout disconnect supervision in remote telephone extensions using voice over packet-data-network systems (VOPS)30 Sep 2014US 8,848,695 B2Cisco Technology, Inc.
- Method and apparatus for providing ringing timeout disconnect supervision in remote telephone extensions using voice over packet-data-network systems (VOPS)28 Feb 2012US 8,126,009 B2Cisco Technology, Inc.
- Method and apparatus for providing ringing timeout disconnect supervision in remote telephone extensions using voice over packet-data-network systems (VOPS)4 Mar 2008US 7,339,924 B1Cisco Technology, Inc.
- Programmable device and methods for disabling a ring signal in response to a detected off-hook condition27 Mar 2007US 7,197,138 B2Integrated Device Technology, Inc.
- Ringing suppression circuit6 Jun 2024US 2024/0187533 A1Amazing Microelectronic Corp.
- System and method of multiple voice call handling4 Aug 2016US 2016/0227025 A1
- Method and apparatus for providing ringing timeout disconnect supervision in remote telephone extensions using voice over packet-data-network systems (vops)6 Aug 2015US 2015/0222760 A1Cisco Technology, Inc.
- Method and apparatus for providing ringing timeout disconnect supervision in remote telephone extensions using voice over packet-data-network systems (vops)7 Mar 2013US 2013/0058325 A1Cisco Technology, Inc.
- Method and apparatus for providing ringing timeout disconnect supervision in remote telephone extensions using voice over packet-data-network systems (VOPS)24 Jul 2008US 2008/0175233 A1Cisco Technology, Inc.
Most cited
By later US patents
- Line feed circuit with logic level controlled ringing89US 5,659,608 ALucent Technologies Inc. · 1997
- Ring trip circuit for subscriber telephone64US 4,995,111 AFujitsu Limited · 1991
- Programmable ring signal generator63US 4,349,703 AInternational Telephone and Telegraph Corporation · 1982
- Monolithic telephone subscriber line interface circuit59US 4,712,233 AFairchild Camera and Instrument Corporation · 1987
- DC level trip detector49US 4,645,881 ATexas Instruments Incorporated · 1987